<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<script>

    var name = 'admin';

    var str1 = "Hello world";
    var str2 = 'Hello world';
    var str3 = `Hello world`;


    var str4 = `Hello ${name}`;

    console.log(str1 + name);
    console.log(str2 + name);
    console.log(str3);
    console.log(str4);
</script>
</body>
</html>